Quote:
There's an op-amp driving a GPIO pin on the CPU. The actual voltage at which it flips is measured relative to the processor's 3V supply line: this is set to be roughly 3/5 of your car battery voltage.

In other words: It's set in hardware and cannot be altered by a software modification. Thanks!

Too bad, but, thanks!

In my case, I get the battery icon because my amp is too f'ing big. Only when the car is idling and there's lots of bass thumping does the problem occur for me. I had once solved the problem by putting some capacitors on the power line to the empeg. But once when troubleshooting some noise issues, I removed the capacitors so I no longer have that advantage.